So just today, Matpat from Game Theory released a video to Youtube containing a theory about Undertale.
You can watch the video here.
But if you're too lazy, I'll just summarize it for you.
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.....Sans the skeleton is supposed to be Ness from Earthbound.
Oh, and Papyrus is a Starman.
Now I know what you're thinking: "But that's crazy! There's no way it can be true!"
That's exactly it. And here's some proof.
-In Sans's secret room, Frisk wouldn't have been able to identify Sans from the pictures of Ness with his friends since Ness actually has skin and different clothing.
-Even though Papyrus has a logo on his costume similar to the Starmen, there's no real proof that Pap is an actual Starman. When he dies, his whole body disappears except for his head, which turns to dust soon after. In Earthbound, we don't see any Starmen get defeated that way.
-Bones are ORGANIC MATERIAL.
Feel free to add more evidence as to why this is fake, but I'm certain we can all agree that Matpat's dun goofed, like he usually does.